153,318 species and infraspecific names are in the database, 20,952 images, 59,301 bibliographic items, 409,170 distributional records.

Aulosira O.Kirchner ex É.Bornet & C.Flahault, 1886

Classification:
Empire Prokaryota
Kingdom Eubacteria
Subkingdom Negibacteria
Phylum Cyanobacteria
Class Cyanophyceae
Subclass Nostocophycidae
Order Nostocales
Family Fortieaceae

Lectotype species: Aulosira laxa O.Kirchner ex Bornet & Flahault

Original publication:Bornet, É. & Flahault, C. (1886 '1888'). Revision des Nostocacées hétérocystées contenues dans les principaux herbiers de France (quatrième et dernier fragment). Annales des Sciences Naturelles, Botanique, Septième Série 7: 177-262.
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Type designated in Geitler, L. (1942). Schizophyta: Klasse Schizophyceae. In: Die natürlichen Pflanzenfamilien, Sweite Auflage. (Engler, A. & Prantl, K. Eds) Vol.1b, pp. 1-232. Leipzig: Wilhelm Engelmann.

Taxonomic status: currently recognized as a distinct genus.

Most recent taxonomic treatment adopted: Komárek, J., Kastovsky, J., Mares, J. & Johansen, J.R. (2014). Taxonomic classification of cyanoprokaryotes (cyanobacterial genera) 2014, using a polyphasic approach. Preslia 86: 295-335.

Description: Filaments solitary or in groups or clusters, rarely in mats, slightly irregularly coiled, sometimes more or less oriented parallel with firm, distinct, colorless sheaths enveloping one (rarely 2) trichomes, open at the ends (young trichomes without sheaths occur rarely). Trichomes of the same width along the whole length, not attenuated towards the ends, constricted at the crosswalls, uniseriate, isopolar, metameric (with several heterocytes developing regularly in certain distances from one another along the trichome). Cells cylindrical or barrel-shaped, more or less isodiametric up to longer than wide, blue-green, pale grayish blue, olive-green or reddish, very rarely with scarce aerotopes, usually with prominent granules; terminal cells not elongated, rounded. Heterocytes spherical, oval or cylindrical, usually of the same width or slightly greater than vegetative cells. Akinetes usually elongated, oval to cylindrical, rarely spherical, developing apoheterocytic (in airways between 2 heterocytes, and successively towards heterocytes), sometimes irregularly. Cells divide transverse to the trichome-axis and grow to original size before the next division; all cells capable of division, without meristematic zones. Reproduction by hormogonia escaping from sheaths and by akinetes. Mainly metaphytic species, found in unpolluted reservoirs, usually among or on submerged aquatic plants, or benthic. Several species are important members of the microflora in paddy fields. Almost all species grow in geographically limited areas, mainly in tropical regions due to special ecology.

Information contributed by: J. Komárek. The most recent alteration to this page was made on 3 Mar 2015 by M.D. Guiry.

Numbers of names and species: There are 31 species names in the database at present, as well as 4 infraspecific names. Of the species names, 30 have been flagged as accepted taxonomically on the basis of the listed literature under the species name. In some instances, opinions on taxonomic validity differ from author to author and users are encouraged to form their own opinion. AlgaeBase is a work in progress and should not be regarded as a definitive source only as a guide to the literature..

Names: ('C' indicates a name that is accepted taxonomically; 'S' a homotypic or heterotypic synonym; 'U' indicates a name of uncertain taxonomic status, but which has been subjected to some verification nomenclaturally; 'P' indicates a preliminary AlgaeBase entry that has not been subjected to any kind of verification. For more information on a species click on it to activate a link to the Species database):

Click here to also show infraspecific names in the list below.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

Created: 11 April 2002 by M.D. Guiry

Verified by: 03 March 2015 by M.D. Guiry

Linking to this page: http://www.algaebase.org/search/genus/detail/?genus_id=43593

Citing AlgaeBase
Please cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 23 October 2018.

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